I tried a physical sunscreen which has taken me two days to get off.  It is labeled "very water resistant".  I believe them.  My skin looks like a dermabrasion job gone wrong.

I checked out the Aveeno & Neutrogena sunscreens that Dr. B has recommended, but they say "water-resistant".   :-

The other alternative, the Anthelios doesn't mention anything about water-resistance, at least on the SkinLab.com website, if I've got the right one:  La Roche-Posay, Hydraphase XL SPF15.

Is there such a thing as a long-lasting sunscreen which isn't water-resistant for those days when you aren't planning anything more than physical than working in the office?  Or are some sunscreens easier to get off than others?